AVR 55 - Harman Kardon Audio Service Manual (repair manual). Page 6

Front Panel Controls

(

Press this 

button to choose either the rear
panel 

jacks · or the

front panel 

˜ as the

input source. When the green light
above the button is illuminated, the
front panel jacks are selected.

Ó

Press

this button to configure the AVR55
for the type of speakers used in your
system. See page 18 for details on
using this button.

Ô

Press this button

to turn the surround modes off to 
listen to a source in traditional two-
channel stereo from the front
left/right speakers only.



Turn this control to

modify the low frequency output of
the left/right channels by as much as
±10dB. Set this control to a suitable
position for your taste and room
acoustics.

Ò

Press this

button to select one of the analog
surround processing modes (Dolby
Pro Logic, Dolby 3 Stereo, Theater,
Hall, Stadium and Church) for a
listening session.

Ú

Turn this control

to modify the high frequency output
of the left/right channels by as much
as ±10dB. Set this control to a
suitable position for your taste and
room acoustics.

Û

Press

this button to listen to a source when
a PCM or Dolby Digital (AC-3*)
signal is present.

NOTE:

Dolby Digital may only be

used with the 

, 

, 

, 

and 

inputs.

Ù

Turn this

control to change the relative volume
for the front left/right channels.

NOTE:

For proper operation of the

surround modes this control should
be at the midpoint, or “12 O’clock”
position.

ı

When the

Û has been

pressed, this button is used to select
the type of digital input to be used.

NOTE:

The coax or optical inputs

may be selected with the 

, 

,

, 

and 

inputs. The 

RF input may be used with the 

input only.

ˆ

Press this button 

to activate the “Night” mode, pre-
venting a loud playback when the
digital modes are in use.

˜

These jack may

be used to temporarily connect an
audio/video source such as a video
game or camcorder to the AVR55. 
To select these jacks as the input,
press the 

button

( until the green LED above that
button is illuminated.

¯

Press this button when

listening at low levels to activate
special circuits that compensate 
for the response of the human ear 
at lower volumes. In the off position
the unit will provide flat frequency
response.

˘

Turn the knob

clockwise to increase volume, 
counterclockwise to decrease the
volume. Note that approximately two
revolutions of the knob are required
to go from no output to maximum
volume.

¸

Press these buttons to raise or lower
the output to the subwoofer channel.
These buttons should be used dur-
ing normal listening sessions for
touch-up adjustments, not when the
test signal is being used for major
system alignment.

33

Press

these buttons to raise or lower the
output to the center channel. These
buttons should be using during
normal listening sessions for touch-
up adjustments, not when the test
signal is being used for major
system alignment.

34

Press these buttons to raise or lower
the output to the surround channels.
These buttons should be used dur-
ing normal listening sessions for
touch-up adjustments, not when the
test signal is being used for major
system alignment.

35

This 

display delivers messages and 
status indications to help you operate
the receiver. Refer to the separate
diagram for complete explanation of
the FL display.

36

The

sensor behind this window receives
infrared signals from the remote con-
trol. Aim the remote at this area and
do not block or cover it unless an
external remote sensor is installed.

37

Press these

buttons to enter or recall stations
entered to the tuner’s preset memory.
See page 25 for complete information
on using the tuner and the preset
memories.